#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <fcntl.h>
#define MYPORT 3490 
#define BACKLOG 10 
main() 
{ 
	int sockfd, new_fd; /* listen on sock_fd, new connection on new_fd */
	struct sockaddr_in my_addr; /* my address information */
	struct sockaddr_in their_addr; /* connector's address information */
	int sin_size;

	char buf[100];
	char *p = buf;
	
	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
	{
		perror("socket");
		exit(1);
	}
	
	my_addr.sin_family = AF_INET; /* host byte order */
	my_addr.sin_port = htons(MYPORT); /* short, network byte order */
	my_addr.sin_addr.s_addr = INADDR_ANY; /* auto-fill with my IP */
	bzero(&(my_addr.sin_zero), \
		sizeof(my_addr.sin_zero)); /* zero the rest of the struct */
	
	if (bind(sockfd, \
		(struct sockaddr *)&my_addr, \
		sizeof(struct sockaddr))== -1) 
	{ 
		perror("bind");
		exit(1); 
	} 
	
	if (listen(sockfd, BACKLOG) == -1) 
	{
		perror("listen"); 
		exit(1); 
	}
	
	while(1) { /* main accept() loop */ 
		sin_size = sizeof(struct sockaddr_in); 
		if ((new_fd = accept(sockfd, \
			(struct sockaddr *)&their_addr, \
			&sin_size)) == -1) 
		{ 
			perror("accept"); 
			continue; 
		} 
		printf("server: got connection from %s\n", inet_ntoa(their_addr.sin_addr)); 
		
		if (!fork()) 
		{ /* this is the child process */ 
			
			printf("server: type messages to client%s:\n", \
				inet_ntoa(their_addr.sin_addr)); 
			fgets(p,99,stdin);
			//if (send(new_fd, "Hello, world!\n", 14, 0) == -1) 
			if (send(new_fd, p, 100, 0) == -1) 
				perror("send"); 
			close(new_fd); 
			exit(0); 
		} 
		
		close(new_fd); /* parent doesn't need this */ 
		//while(waitpid(-1,NULL,WNOHANG) > 0); /* clean up child processes */ 
		
	} 
} 

